From the given information, we can see that Student 2 reads 30 pages in 2 hours, which is 15 pages per hour. Similarly, Student 2 reads 45 pages in 3 hours, which is again 15 pages per hour. However, when we look at the reading rate of Student 1 from the graph, the maximum reading rate is 10 pages per hour. Therefore, Student 2 reads faster than Student 1 by 5 pages per hour.
So the correct answer is: Student 2 reads faster than Student 1 by 5 pages per hour.